Apache Accumulo v1.7.2 發布，一個高性能的Key-Value 存儲

Apache Accumulo 是一個有序的分布式Key-Value存儲，提供了強大的，可擴展的數據存儲和檢索。 Apache Accumulo是一個基于谷歌Big Table、采用鍵值的分布式數據存儲。這個開源選項是由美國國家安全局開發，并于2011年發布的。Accumulo是一個可在Hadoop環境中運行的Apache項目，它具有Big Table中所沒有的功能，其中被包括了基于單元的訪問控制。

體系結構

更新日志

• Write-Ahead Logs can be prematurely deleted
• Upgrade to Commons-VFS 2.1
• Native Map failed to increment mutation count properly
• Open WAL files could prevent DataNode decomission
• Remove unnecessary copy of cached RFile index blocks
• Analyze Key-length to avoid choosing large Keys for RFile Index blocks
• Minor performance improvements.
• ACCUMULO-3923 bootstrap_hdfs.sh script would copy incorrect jars to hdfs.
• ACCUMULO-4146 Avoid copy of RFile Index Blocks when already in cache.
• ACCUMULO-4155 No longer publish javadoc for non-public API to website. (Still available in javadoc jars in maven)
• ACCUMULO-4173 Provide balancer to balance table within subset of hosts.
• ACCUMULO-4334 Ingest rates reported through JMX did not match rates reported by Monitor.
• ACCUMULO-4335 Error conditions that result in a Halt should ensure non-zero process exit code.
• 詳見：release_notes

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